Feed mechanism for book-sewing machines



' G. A. PAULSEN FEED MECHANISM FOR 1300K sfiwme mcams Filedllarch 9, 1922 "'2 su s-sheet 1 I I I l I [72 2/9725)? 6%15220 Q. fizzZsezz.

JuIyIS, 1924-- G. A. PAULSEN FEED MECHANISM FOR BOOK SEWING mAc rimlss Filed March 9, 1922 '2 sheetaesheet 2 Patented July 15, 1924.

UNITED STATES PATENT OFFICE.

GUSTAV A. PAULSEN, OF CHICAGO, ILLINOIS, ASSIGNOR TO JOSEPI-IE'. SMYTH GOM- PANY, OF CHICAGO,'ILLINOIS.

FEED MECHANISM FOR BOOK-SEWING MACHINES.

Application filed March 9, 1922. Serial No. 542,514.

T 0 all whom it may concern.

Be it known that I, GUSTAV A. PAULSEN, a citizen of the United States, residing at Chicago, in the county of Cook and- State of Illinois, have invented a certain new and useful Improvement in Feed Mechanism for Book-Sewing Machines, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to feed mechanisms for book sewing machines, an object being to provide an improved and simplified mechanism of this character which is most positive in its operation and also constructed so as to effect intermittent feed of any degree within the limit of reciprocation of the driving pawl.

In book sewing machines abook support is provided against which the sewed book sections rest, which support is fed way from the sewing mechanism as the different sections are added and sewed on. These sections, of course, vary in thickness depending upon the number of pages to a section and the thickness of the paper used. It will thus be apparent that the sewing machine may be used for stitching sections in different books that vary from a few thousandths of an inch up. In feed mechanisms for advancing the book support as heretofore used, the supports have been advanceable only to certain distances which frequently were slightly greater than the thickness of the book section, as where a ratchet and tooth feed was used. That is, with such feed mechanism it is impossible to regulate the intermittent advance to correspond with every book section.

One of the features of my invention is the provision of an adjustable feed mechanism which may be varied to intermittently feed from zero up, within the limit of move ment of the feed pawl.

Thus, I overcome the objections to the feed mechanism heretofore used and at the same time provide a device which is most positive in its action, simple and cheap to manufacture and easy to adjust.

For a better understanding of my invention reference is to be had to the abcoinpanying drawings in which- Fig. 1 is a side elevation of a portion of a book sewing machine showing the work table and book support feed mechanism;

Fig. 2 is a section along the line'22 of Fig. 4 showing the feed mechanism;

Fig. 3 is an enlarged View of the feed mechanism;

Fig. 4 is a right elevation of Fig. 3; and

ported by sprocket or belt operating wheels 1 1-1 1, rotatably mounted on the work table, saidchain carrying said book support along the table and being in mesh with the feed sprocket wheel 15. Said work table 12 is vertically adjustable at the standard 18 so as to regulate the height of the work table 12, depending upon the size of the book to be sewed. The feed sprocket wheel 15 is car ried by a shaft 16 mounted transversely of the work table 12 in a suitable number of bearing blocks 17. It will, of course, be un derstood that usually a number of sprocket wheels 15 and feed chains 13 are adjacently mounted upon the table depending upon the size of the work to be done, but I have simply shown one such chain and wheel.

Now as to the intermittent feeding device, I provide a feed wheel 19 immovably secured to the shaft 16 by the pin 20;- This feed wheel 19 is adapted to be engaged by afeed pawl 21 which is adapted to be reciprocated and adjustable from zero to a maximum movement within the limit of adjustment of the feed arm. Also, the parts are so constructed that the feed advance corresponds tothe adjustment of the feed arm, that is from zero up. This, it will be a p parent" is different from the ordinary ratchetfeed wherein the distance of the feed can only be varied according to the toothed construction. Inmy improved construction, however, I use a plain surface for the feed element as distinguishing from an unduiae ing or toothed surface.

Now as to the pawl sauteed arm construction', I preferably provide aj-bar 22 pivo'tally lots carried on the sleeve 23, which sleeve is immovably held in the bracket 17 and acts as a bearing for the shaft 16. This bar 22 is frictionally held against too free movement by the spring-pressed. brake mechanism 24: carried in the bar 22 and pressing against the sleeve 23. The purpose of this will be hereinafter more particularly referred to. However, it will be noted that the bar 22- swings on the sleeve 23 and is thus free from interfering with the feed wheel or shaft. Secured to the bar 22 is an operating bar 25 pivotally attached by the bolt 26 so that the bar 25 may pivot on the bar 22, this pivotal movement being limited by the screw stop 27 which extends through the slot 28 in the bar .25. This pivotal move-- ment of the bar 25 is only sufficient to per mit freeing the pawl 21 from the feed wheel 19, as will be more particularly referred to. The said operating bar 25 carries pawl 21 which pawl is in the nature of an immovably held wheel 21., being thus held by a set screw 29.

In order to effect a proper gripping operation of the feed wheel and pawl I preferably provide angular co-operating gripping surfaces, the wheel 19 having opposite angular surfaces 19 and 19 and the pawl 21 having component angular gripping surfaces 21 and 21 arranged to wedgingly engage the angular surfaces on the feed wheel to rotatably advance the same. The pawl member 21 it is to be noted, is rota-- tably adjustable so that it may be adjusted to take up for wear at any part of its grip-- ping surfaces.

In Fig. 4 I have shown the feed arm in full lines in the gripping position. the dotted lines indicating the position of the operating arm 25 as it is being drawn back in preparation. for another advance.

In the operation of the feed pawl I preferably arrange the feed arm. so that upon the return reciprocation of the arm the pawl 21 first disengages from the feed wheel 19 by an outward movement away from the feed wheel so as to prevent the pawl from dragging the feed wheel backwardly. This is brought about by the pivotal adjustment of the bars 25-22 at the stud 26. That is, assuming the feed arm has been advanced as shown by the full lines in Fig. 4, as soon as the operating bar 25 is pulled backwardly it starts to pivot on stud 26 into its position as indicated by the dotted lines thereby moving the pawl 21 away from the feed wheel 19 as indicated by the arrow passing through the center of the pawl 21. This pivotal movement of the. bar 25 is limited by the stop screw 27 as heretofore explained,

and in order to hold the operating bar 22 so as to permit the said pivotal movement, the spring brake 24 acts sufiiciently upon the sleeve 23 to permit this preliminary movement of the bar 25. As soon, however, as the end of the slot 28 engages the pin 27 the continued movement of the operating bar 25 pulls the supporting bar 22 and of course the pawl 21 back to the extent of movement of the feed arm. Now, when the feed arm is reciprocated in the feed direction, the operating bar 25 again pivots on the holding bar 22 until the pawl 21 wedgingly engages the feed wheel 19 sufficiently to advance the wheel. During this preliminary movement of the arm 25 the holding bar 22 is, of course, held by the brake 24 until the pawl and wheel are engaged after which the continued movement of the feed arm advances the feed wheel.

To operate the feed arm I provide a suitable link 31 which is pivotally attached to the feed arm by suitable bolt 32 passing through the slot 33 so as to provide for adjustment of the length of stroke. That is, assuming the bar 31 is always given the same longitudinal movement, by varying the position of the bolt 32 in the slot 33, the reciprocation of the feed arm is correspondingly varied. With the bolt 32 at the lower end of the slot a shorter reciprocation of the feed arm is given than when the bolt 32 is at the upper end of the slot. The link 31 is shown as pivotally connected to the reciproeating arm on the book sewing machine.

For the purpose of illustration I have shown my invention in its preferred form, but I appreciate that it may be used in other ways than shown, such as for example a straight feed element instead of a circular feed wheel may be used, and I contemplate applying my invention in other ways than that shown. Therefore, I do not desire to be limited to the exact structure shown and described, but aim to cover all that which comes within the spirit and scope of the appended claims.

/Vhat I claim as new and desire to secure by United States Letters Patent is:

1. In a feed mechanism. of the character described, a rotatable feed wheel having a plain driving surface, a movable arm, and means carried by said arm for gripping the plain driving surface of the wheel by move- .ment of the arm and advancing said wheel by the movement of said arm and thereafter releasing said gripping means, so as to intermittently rotate said wheel.

2. In a feed mechanism of the character described, a rotatable feed wheel having a plain driving surface, a reciprocable arm, and means carried by said arm for gripping the plain driving surface of the wheel by the movement of the arm and advancing said wheel by the reciprocable movement of said arm and thereafter releasing said gripping means, so as to intermittently rotate said wheel.

3. In a feed mechanism of the character described, an advanceable feed element having a plain driving surface corresponding to the line of travel of said element, a coacting gripping element having a corresponding gripping surface, said surfaces being angularly disposed so as to effect a wedging cooperation, and means for advancing said gripping element so as to effect a wedging engagement between the corresponding surfaces of said elements at any point along the surface of the feed element. whereby the continued movement of the gripping element causes an advance of the feed element.

4. In a feed mechanism of the character described, a rotatable feed element having a plain peripheral surface angular relative to the axis of rotation, a coacting gripping element having a corresponding angular gripping surface, and means for advancing said gripping element so as to efiect a wedging engagement between the angular surfaces of said elements at any point along the plain angular surface of the feed element whereby the continued movement of the gripping element causes a rotation of the feed element.

5. In a feed mechanism of the character described, a rotatable feed wheel having a plain driving surface, a feed arm reciprocatingly mounted on the axis of rotation of the feed wheel, a pivotally mounted gripping element so carried by the feed arm, whereby upon each reciprocation of the feed arm said gripping element will en age the plain driving surface and rotate the feed wheel and thereafter disengage.

6. In a feed mechanism of the character described, a rotatable feed wheel having a plain driving surface, a feed arm reciprocatingly mounted on the axis of rotation of the feed wheel, a pivotally mounted gripping element so carried by the feed arm, whereby upon each reciprocation of the feed arm said gripping element will engage the the same.

8. In a feed mechanism of the character described, a rotatable feed wheel having an nular opposed angular gripping surfaces, and a pivotally mounted reciprocable pawl having component angular gripping surfaces arranged to Wedgingly engage the angular surfaces on the Wheel to rotatably advance the same, and means for varying the movement of the pawl so as to effect any angular advance of the feed wheel within the limit of reciprocation of the pawl.

9. In a feed mechanism for book sewin machines, a work table, a book support slidably mounted on said table, a belt connected with said support, an operating wheel for advancing the belt to move the support, a driving wheel connected with the operating Wheel for rotating the latter, a variable movable reciprocable feed arm, and co-operating means on the driving wheel and feed arm to effect any distance of advance of the book support upon each reciprocation of the feed arm within the limit of reciprocation of the feed arm.

In witness whereof, I hereunto subscribe my name this lath day of February, A. D. 1922.

GUSTAV A. PAULSEN. 

